Warp stop-motion for looms.



PATENTED JULY 28, 1907.

J. K. LANNING. WARP STOP MOTION FOR LOOMS.

APPLIUATION FILED JUNE 7, 1907.

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JAMES K. LANNING, OF BOSTON, MASSACHUSETTS.

WARP STOP-MOTION FOR LOOMS.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed June 7,1907. Serial No. 377,731.

To all whom it may concern:

the United States, residing at Boston, in the county of Suffolk, Stateof Massachusetts, have invented an Improvement in Warp Stop-Motions forLooms, of which the following description, in connection with theaccompanying drawings, is a specification, like letters on the drawingsrepresenting like parts.

My invention relates to warp stop motions for looms, being moreparticularly concerned with, but not limited to, the provision ofimprovements to be used in connection with electrical warp stop motions.

The invention will be best understood by reference to the followingdescription when taken in connection with the accompanying illustrationof one specific embodiment thereof, the scope of the invention beingmore particularly pointed out in the appended claims.

In the drawing, wherein a single type of the invention is illustrated,Figure 1 is a side elevation of a loom frame with attachments appliedthereto embodying one form of my invention; and Fig. 2 is a detail view,partly in side elevation and partly in vertical section, of one mannerof supporting lease rods in accordance with my invention.

In the drawing, I/have shown my invention as applied to a particularconstruction of loom and a particular type of warp stop motion, but itis to be understood that such. is for the purpose of illustration only,and that my invention in any desired embodiment thereof may be adaptedto looms and stop motions of other and quite different types, whetherelectrical or mechanical.

Referring to the drawings, I have illustrated the side member 1 of aloom provided with a well-known construction of belt shifting device,which is thrown into operation through the action of the drop bars ofthe warp stop motion in a manner well understood in the art, it beingunnecessary to describe in detail the construction and operation of suchbelt shifting device. In the present instance, I have shown the loom asprovided with circuit establishing devices for the warp stop motion ofthe same general construction as is described in Patent No. 690,636 toColdwell & Gilda-rd.

To the side frame members 1 are adjustably bolted the upright anglebrackets 2, which sustain the various contact devices for the warp stopmotion. These may comprise a single tubular contact bar 3 (see Fig. 2)supported at its ends by suitable insulating plugs, which may be securedin any suitable manner upon the angle brackets 2. Connection is hadbetween the tubular contact bar 3 and one side of the circuit leading tothe controlling magnet 4 by means of a contact wire 5 (see Fig. 1.),preferably passing through one of the insulating plugs. The other sideof the circuit,

as will be understood by those skilled in the art, is connected throughthe frame of the machine to the over head circuit and guiding rods 6(see Fig. 2), which are shown as converging toward their upper edges andsecured at their opposite ends to lugs projecting inwardly from thebrackets 2.

In the present type of my invention, supported above the contact rods 6upon the brackets 2 and engaging at their ends with inturned studssustained by said brackets are tubular lease members, herein representedas rods 7 and 8, which maintain the threads of the warp in a leasedcondition with successive threads crossed in a fashion well understoodto those skilled in the art.

Upon successive warp threads are suspended drop bars 9, herein andpreferably arranged in two sets, the drop bars of one set beingsustained by one series of threads and having their open depending legsembracing one of the circuit rods and the drop bars of the other setbeing sustained by the other series of threads and embracing the othercircuit rod. In the illustrated construction, as in the aforesaid priorpatent, No. 690,636, the drop bars are provided with closed longitudinalslots 10, through each of which passes a transverse retaining rod, therod for one set of bars being indicated at 11 and that for the other setbeing indicated at 12. The ends of said retaining rods are suitablysupported in any desired manner in the brackets 2. It is, of course, tobe understood that any desired form or type of drop or indicating barsmay be employed The drop bars and detectors are maintained in accu ratecontact with the contact rods 6 under all conditions of use. A break inone of the warp threads causes the drop bar supported thereby to falland contact with the contact bar 3, completing the circuit andenergizing the electro-magnet controlling the dvice for the immediatestoppage of the loom.

It is quite desirable that the leasing members 7 and 8 should so controlthe position of the threads that the desirable relation between the dropbars and the cooperating contact device should be maintained withoutdisplacement, as otherwise vibratory movements of the lay may causedisarrangement of the drop bars relatively to the contact rods. It hasbeen found, however, that if the lease rods be held. rigidly and fixedlythat increasing frictional resistance is apt to be put upon the warpthreads particularly if the attendant is careless in adjusting the warpor the harness. To avoid the enumerated and other objections, Ipreferably mount each lease rod for movement in conformity with theleveling or compensating movements of the warp. In the type of stopmotion herein selected, the leasing members 7 and 8 serve not only theusual function common in looms of separating the warp threads in suchmanner that the warp feeds easily and the threads are properly separatedand control thereof for repair and manipulation is rendered easier, butin addition the leasing members serve the additional function ofsupporting the warp against the weight of the drop bars. ,Moreover,where the special form of drop bar here shown is used, the advantagesincident thereto are obtained. By providing a construction andarrangement whereby the guiding means for the drop bars and the devicesintended to cooperate with the drop bars in their indicating movement tostop the loom, are held in fixed relation so as not to partake of themovements of one or more of the leasing members and preferably arerigidly connected to the loom frame, while the warp supporting leasemembers or rods, which not only separate the warp but support the sameagainst the weight of the drop bars as above noted, are given a certainfreedom of movement which preferably is so confined as not materially tomove the drop bars lengthwise of the warps, not only is more freedomgiven to the warp in its travel by the lease rods and through the dropbars, but greater certainty of stopping action of the stopping mechanismis obtained. A limited movement of the lease rods or members is moreoveradvantageous, because of the fact that in placing a warp in the loom theweaver or loom fixer may not so adjust the harnesses that the middlepoint of the shed may be in the same plane as the top of the wheel rolland the lease rods. This supporting of the lease rods so as to permitslight movement thereof 'compensates for this, as well as permittingslight movement when there is a variation of tension or other change inthe warp. A warp thread having broken, the drop bar positioned thereonfalls and is guided by a stationary guide bar into contact or engagementwith the lower cooperating device entirely free of any further movementthat may be imparted to the warp supporting lease rods. Not only so, butthe movement of the lease rods and the supported threads and drop barstend, if anything, to increase'the tendency of the released drop bar onthe broken thread to fall. All the advantages therefore of permanentlypositioned guiding and stopping devices are had together with theadvantage of relatively freely moving warp supporting bars and leaserods or members.

I11 the present type of the invention, in each bracket or casting 2 Imount for free swinging movement a plurality of lovers 13, hereinrepresented as two in number, each being adapted to receive and supportan end of a leasing member or red 7 and 8, whereby the said leasingmembers may conform to the leveling requirements of the warp. I do notherein broadly claim warp supporting leasing rods or members mounted formovement in conformity with the leveling requirements of the warp andmounted for such movement independently of means cooperating with loomstopping mechanism whether electrical or mechanical, but I do hereinclaim broadly mechanism whereby an individual or independent ordifierential moveme'nt may be imparted to each leasing member or rod ofa plurality of leasing members. The leasing members disclosed herein arepositively connected by rigid but pivoted or swinging members to theloom frame. It frequently occurs that a loom fixer or weaver so adjuststhe warp that the central point between the extremes of movement of theharnesses is above or below the whip roll or other part of the loomaffected by the movement of the other leasing member or members. Asindicated by the arrows upon Figs. 1 and 2, the levers 13 are inclinedin the direction of forward movement of the warp threads, whereby thereis no tendency of the leveling action of the warp to cramp said leverswith relation to their bearings.

Preferably I provide means to limit or confinethe movement of theleasing members or rods in conformity with the compensating or levelingmovements of the warp, and herein for that purpose provide upon eachcasting or bracket 2 preferably integrally formed lugs or stops 14 and15 mounted respectively above and below the levers 13. The position ofsuch lugs should be such as to afford the desired freedom of movement ofthe leasing members. Preferably I provide springs as 16, which whenunder tension normally support the weight of the lease rods, theirsupporting levers 13, and cooperating parts, so that said levers arenormally free of the stops 14 and 15, and are free to move in accordancewith the leveling requirement of the warp, such movement toward thestops 15 being cushioned by said springs and being in opposition to thetension or supporting action of said springs.

I do not herein claim broadly the provision of resilient means forsupporting independently mounted lease rods to take their weight off thewarp, nor do I desire to claim the same broadly, but merely incombination with means for mounting said rods or members so that theyhave other than a right line movement in response to the levelingrequirements of the warp, such movement in this embodiment of theinvention being a pivoted or swinging movement.

Having thus described one type or embodiment of my invention, I desireit to be understood that although I have employed specific terms, theyare used in a generic and descriptive sense and not for purposes oflimitation, the scope of the invention being set forth in the followingclaims.

Claims.

1. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar andcircuit establishing means cooperating with an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for movement independently of each other to alinewith the natural travel of the warp, said support of the leasing memberspermitting such movement without movement of the said guiding means forthe drop bars.

2. In a warp stop motion for a loom, the combination with a plurality ofwarp thread supporting lease rods, of one or more series of drop barssupported on the sheets of threads formed by said lease rods, said leaserods being mounted for movement independently of each other and inconformity with the leveling requirements of the warp, fixed guidingmeans to guide the movement of an indicating drop bar, and fixed meansto cooperate with said indicating drop bar to stop the loom.

3. In a warp stop motion for a loom, the combination with a pluralityof. lease rods dividing the Warp into' sheets, of one or more series ofdrop bars supported upon the sheets of threads formed by said leaserods, said rods being mounted independently of each other upon the machine to permit independent movement in conformity with the levelingrequirements of the warp, guiding means to guide the movement of anindicating drop bar, and means to cooperate with said indicating dropbar to stop the loom, said guiding means and said cooperating meansbeing supported to permit movement of one or more of said lease rodsindependently of said guiding means and said cooperating means.

4. In a warp stop motion for a loom, the combination with a plurality oflease rods mounted for movement independently of each other anddividing; the warp into sheets, a plurality of series of drop barssupported by the warp threads where so separated into sheets, guidingmeans to guide the loom stopping movement of the drop bars, and meanscooperating with the loom stopping mechanism and with which anindicating drop bar is adapted to cooperate, said guiding means and saidmeans cooperating with the loom stopping mechanism being supported topermit movement of one or more of said lease rods independently thereofin conformity with the adjusting movements of the warp.

In a warp stop motion for a loom, the combination with a plurality oflease rods movable independently of each other and dividing the warpinto sheets, a plurality of series of drop bars supported by the warpthreads where so separated into sheets, guiding means to guide the loomstopping movement of the drop bars, and means cooperating with the loomstopping mechanism and with which an indicating drop bar is adapted tocooperate, said guiding means and said means cooperating with the loomstopping mechanism being supported upon the loom frame.

ii. In a warp stop motion for a loom, the combination with a pluralityof warp thread supporting lease rods dividiug the warp into sheets andmounted for movement independently of each other in accordance with theleveling requirements of the warp, one or more series of drop barssupported upon said sheets of warps between the lease rods, guidingmeans to guide the loom stopping movement of the drop bars, and meanscoiiperating with the loom stopping mechanism and with which anindicating drop bar is adapted to coiiperate, said guiding means andsaid means coiiperating with the loomstopping mechanism being supportedto permit the defined movement of the lease rods independently thereof.

7. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar, andcircuit establishing means cooperating with an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for diiferential move ment with respect to eachother, whereby they may individually and differentially aline with thenatural travel of the warp, said support of the leasing memberspermitting such movement without movement of the said guiding means forthe drop bars.

S. In a warp stop motion for a loom, the combination with a plurality oflease rods dividing the warp into sheets, of one or more series of dropbars supported upon the sheets of threads formed by said lease rods,said rods being mounted for differential movement with respect to eachother in conformity with the leveling requirements of the warp, guidingmeans to guide the movement of an indicating drop bar, and means tocooperate with said indicating drop bar to stop the loom, said guidingmeans and said coiiperating means being supported to permit movement ofone or more of said lease rods independently of said guiding means andsaid cooperating means.

9. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar, andcircuit establishing means cooperating with an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for swinging move ment independently of eachother, whereby they may individually conform to the levelingrequirements of the warp, the support of the leasing members permittingsuch described movement thereof without movement of the said guidingmeans for the drop bars.

10. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar, andcircuit establishing means cooperating with an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for swinging movement independently of each other,whereby they may individually conform to the leveling requirements ofthe Warp, the support of the leasing members permitting such describedmovement thereof without movement of the said guiding means for the dropbars, and means to limit the described movement of said leasing members.

11. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar, andcircuit establishing means cooperating With an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for independent, differential movement inconformity with the leveling requirements of the warp, means to limitsuch movement of the leasing members, the support for the leasingmembers permitting the defined movement thereof without movement of thesaid guiding means for the drop bars.

12. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar, andcircuit establishing means cooperating with an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for swinging movement independently of each other,whereby they may individually conform to the leveling requirements ofthe warp, and means to support the leasing members to take their weightoff the warp, the support of the leasing members permitting thedescribed swinging independent movement of the leasing members withoutmovement of the said guiding means for the drop bars.

13. In a warp stop motion for a loom, the combination with drop bars,guiding means to guide the movement of an indicating drop bar, andcircuit establishing means cooperating with an indicating drop bar tostop the loom, of warp supporting leasing members between which the dropbars are supported upon the leased threads of the warp, said leasingmembers being mounted for swinging movement independently of each other,whereby they may individually conform to the leveling requirements ofthe warp, and resilient means to support the leasing members to taketheir weight off the warp, the support of the leasing members permittingthe described swinging, independent movement of the leasing memberswithout movement of the said guiding means for the drop bars.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

JAMES K. LANNiNG Witnesses:

AGNES B. HUDSON, ALICE RICHMOND BROWN.

